Overview     History     Acknowledgements     Podcasts     Notification Form     Feedback Form     Press Release #1     Press Release #2     Press Release #3 Master SOA Design Pattern Catalog     Master Pattern List (alphabetical)     Master Pattern List (by category)     Master Pattern List with Page Numbers (PDF)     Master Pattern List (Text)     Pattern Notation     Pattern Profiles     Symbol Legend     Pattern Contribution Form SOA Candidate Patterns     Candidate Patterns Overview     Candidate Patterns List     Candidate Pattern Contribution Form     Candidate Pattern Feedback Form Design Pattern Basics     What's a Design Pattern?     What's a Design Pattern Language?     What's a Compound Pattern? Supplemental     SOA Patterns and Application Technologies     SOA Design Patterns Historical Influences     SOA Design Patterns and Design Principles     SOA Design Patterns and Design Granularity Resources     Design Patterns Publications     SOA Principles Poster (PDF)     SOAPrinciples.com     WhatIsSOA.com     SOA Visio Stencil Contract Denormalization (Erl) Home > Service Contract Design Patterns > Contract Denormalization How can a service contract facilitate consumer programs with differing data exchange requirements?   Problem Services with strictly normalized contracts can impose unnecessary functional and performace demands on some consumer programs. Solution Service contracts can include a measured extent of denormalization, allowing multiple capabilities to redundantly express core functions in different ways for different types of consumer programs. Application The service contract is carefully extended with additional capabilities that provide functional variations of a primary capability. Impacts Overuse of this pattern on the same contract can dramatically increase its size, making it difficult to interpret and unwieldy to govern. Principles Standardized Service Contract, Service Loose Coupling Architecture Service   Equipped with additional (albeit redundant) capabilities, the Invoice service is able to better accommodate the individual requirements of the three consumers. Audio Podcast This pattern is discussed as part of the audio podcast: Service Contract-Related SOA Design Patterns   Related Patterns in This Catalog Canonical Expression (Erl), Compensating Transaction (Utschig, Maier, Trops, Normann, Winterberg, Loesgen, Little), Concurrent Contracts (Erl), Decomposed Capability (Erl), Decoupled Contract (Erl), Proxy Capability (Erl), Service Facade (Erl), Service Normalization (Erl) Related Service-Oriented Computing Goals Increased Intrinsic Interoperability, Reduced IT Burden This page contains excerpts from: SOA Design Patterns by Thomas Erl Foreword by Grady Booch With contributions from David Chappell, Jason Hogg, Anish Karmarkar, Mark Little, David Orchard, Satadru Roy, Thomas Rischbeck, Arnaud Simon, Clemens Utschig, Dennis Wisnosky, and others. (ISBN: 0136135161, Hardcover, Full-Color, 400+ Illustrations, 865 pages) For more information about this book, visit www.soabooks.com.

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